DFD 20Ah 40135 LFP Cylinder Passes GB 47372-2026 3C Certification — 64Wh Cell Already Used in 256Wh Outdoor Power Station
2026-09-25 · Compiled by Best IT Parts from public industry reporting
China's GB 47372-2026 safety specification for mobile power supplies keeps pulling new cells into 3C certification, and the latest approval moves up in can size. A 20Ah lithium iron phosphate cylindrical cell in the 40135 format has been certified against both GB 31241-2022 and GB 47372-2026. According to the certificate data, the cell is rated 3.2V nominal, 20Ah (20,000mAh) and 64Wh per cell, with a charge limit voltage of 3.65V.
The 3C certificate, numbered 2026010916894371, was first issued on 18 September 2026 and formally issued on 20 September 2026, valid through 17 September 2031, and remains active; applicant, manufacturer and production plant are recorded as the same cell maker, DFD. Certified capacity so far has concentrated in 5000mAh- and 10000mAh-class pouch cells, so a 20,000mAh, 64Wh round cell sits at the large-capacity end of the certified line-up. Cylindrical coverage previously reached the 26700 size, and the 40135 format extends it further.
The model is already in volume use rather than certification-only. A teardown of a 240D portable power station found four LFR40135-20Ah cells wired 4S into a 256Wh pack, matching the 3.2V, 20Ah and 64Wh single-cell ratings now certified.
For buyers sourcing for outdoor power stations and high-capacity portable storage, the significance is a wider certified option set in LFP round cells. Fewer, larger cans simplify pack assembly and series wiring, but they require more enclosure height than stacked pouch designs, so the trade-off sits in mechanical layout and BMS design rather than cell availability.
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Technical details are reproduced as reported. Verify specifications against the original source before design or procurement decisions.